VulnSocial

CVE-2026-53899Disclosure(mozilla / firefox_mobile)

LOWCVSS 6.5 · MEDIUM

Signal is active with 3 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Firefox for iOS used partial domain matching when attaching cookies to PDF requests, allowing a malicious site on a suffix domain to receive cookies belonging to the target site. This vulnerability was fixed in Firefox for iOS 152.0.

mozilla CVEsBack to dashboard
0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-345

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • firefox_mobile

Threat summary

  • 3 mentions across 1 observed day

What's happening

  • Technical details provided in 3 signals
  • Disclosure: 3 classified signals
  • 3 total mentions across 1 day

Affected systems

Vendors
mozilla
Products
firefox_mobile

Deep dive

Activity timeline3 mentions / 1d
01223Mentions · 2026-06-16: 3Technical Details · 2026-06-16: 306-16
Signal classification1 categories
Disclosure
3100.0%
Referenced assets3 URLs
Full discourse3 posts
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-53899 Firefox for iOS used partial domain matching when attaching cookies to PDF requests, allowing a malicious site on a suffix domain to receive cookies belonging to the … https://www.cve.org/CVERecord?id=CVE-2026-53899 ----- Traducción: CVE-2026-53899 Fir… http://infoflow.cloud`

    Post summary

    The post announces CVE‑2026‑53899, a flaw in Firefox for iOS that permits malicious suffix domains to capture cookies from PDF requests.

    0000028
    82 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-53899 Firefox for iOS used partial domain matching when attaching cookies to PDF requests, allowing a malicious site on a suffix domain to receive cookies belonging to the … https://www.cve.org/CVERecord?id=CVE-2026-53899

    Post summary

    The statement describes how Firefox for iOS’s partial domain matching during PDF cookie handling enables cookie theft by suffix-domain sites, but it does not report any exploitation, patches, or PoC details.

    00000247
    57.6K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-53899 Cookie Leakage via Partial Domain Matching in Firefox for iOS Below 152.0 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-53899

    Post summary

    The post discloses CVE‑2026‑53899, describing a cookie leakage flaw caused by partial domain matching in Firefox for iOS versions below 152.0, without any PoC, exploit, or patch information.

    0000037
    4.0K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox_mobile-iphone_os-

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